Combined type-writing and computing machine.



H. HANSON.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED APR. I. [9!3. m 1 ,279,81 Patentedcept. 24, 1918.

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H. HANSON,

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED APR. I. I913.

1 ,279,861 Patented Sept. 24, 1918.

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WITNESSES: N //v!//v ran I M A MJW /,A/ @4232, BV @6475 ATTORNEY H. HANSON.

COMBINED TYPE WRITING AND COMPUTiNG MACHINE.

Patented Sept. 24, 1918.

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H. HANSON.

COMBINED TYPE WRlTING AND COMPUTING MACHINE.

APPLICATION FILED APR. I. 1913.

Patented Sept. 24, 1918.

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Patented Sept. 24, 1918.

H. HANSON.

APPLICATION FILED APR. 1. 1913.

COMBINED TYPE WRITING AND COMPUTRNG MACHSNE.

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comameo TYPE WRHING AND COMPUTING MACHINE.

APPLICATION FILED APR. 1. F913. 1 ,279,861. Patented Sept. 24, 1918,

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H.HANSONL COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED APR.I. 1913 Patented Sept. 24, 1918.

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COMBINED TYPE WRITING AND COMPUTING MACHINE APPLICATION FILED APR.I. 1913.

1,279,861. PatentedSept. 24, 1918.

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UNITED STATES PATENT OFFICE.

HANS HANSON, OF HARTFORD, CONNECTICUT, ASSIG-NOR, BY, MESNE ASSIGNMENTS,

'I'O UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N; Y., A CORPO- RATION. OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING MACHINE.

Specification of Letters Patent.

Patented Sept. 24,1918.

Application filed April 1, 1913. Serial No. 758,091;

Connecticut, have invented certain new and useful Improvements in Combined Type IVrit-ing and Computing Machines, of which thefollowing is a specification.

This invention relates to computing machines, and is herein disclosed as applied to a combined typewriting and computing ma chine of the Underwood-Hanson type.

In machines of that type the numeral keys of: the typewriter set up numbers on pin bars, which numbers are later carried into computing wheels by. means ofa general operator; said pin bars including racks which rotate said wheels to an extent determined in each case by the pins set on said pin bars. The powerywhich drives the general operator in said machines is also used to ope "ate a carry-over mechanism.- Said carry-over mechanism is arranged to be completely operated after the, numbersset up on the pin bars-have been completely carried into the computing wheels. 7

The present invention is disclosed as applied to machines of theabove-named'type, and which are arranged to beused for either addition or subtraction. Machines of'the types referred to are shown intheapplications of B. C. Stickney, No. 696,838,,filed May 13, 1912, and 0. IV. Olmsted, No. (391,828, filed April 19, 1912, (now Patents Nos. 1,260,728 and 1,224,314, respectively). For this purpose the racks, which drive the computing wheels, may be double racks, which, may travel in uniform paths. The

computing wheels preferably are mounted ona-n arbor. forming part of a frame for said wheels. Preferably the wheels are normally out of engagementwith either set of racks, but the initial movement of the general operator swings the frame carrying the computing wheels to.mo.ve. the wheels into engagement wit-hone or the other of said racks, according to whether the machine is set foraddition or subtraction, and turns the computing wheels accordingly.

lVhen the computing wheels have been thus turned by the general operator, said operatorpreferably frees the litCkSflOllIzi'hQ computing wheels, and then ,bringsinto op.- eration a carry over mechanism. To insure uniform operation of said carry-over mechanism on the computing wheels, said mechanism preferably forms part of the frame on. which said wheels are mounted, and where a power drive is used for'said mechanism, the;

whole frame carryingthe computingwheels and carry-over mechanism is preferably pivoted on the shaft of said power drive, so

that the power drive will bear the same'relationto the mechanism no matter in what position the computing wheels happen to'be.

In the preferred form of thezpresent' invention, the carry-over mechanism for each wheel comprises an interponent which is adapted to be set to an eflective position whenever the computing wheel completes a revolution. After the general operator has completed the turning of the computing wheels, and has freed said'wheels from the racks which drive them, the power shaft for the carry-overmechanism. may cooperate with any such interponent as has-been'set by the, computing wheels, to raisea pawl con; trolled by said interponent into mesh with the adjoining computing wheel, and then cause said pawl to turn said adjacent computing wheel one unit space. In so moviiw the pawl, the power device may return saic pawl to its normal idle position, thus making the carry-over device ready for the next computing operation.

In its preferred form, the present invention has a single pawl for both carrying-over in adding and tens-borrowing in subtracting, and theinterponentdetermines whether said pawlshall be operated-for adding or for subtracting.

Other features-and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view, showing the principal parts ofthe carry-overmechanism.

Fi 2 is a section of a clutch on the driveshaft ofsaid carry-over mechanism.-

Ei 3 is a sectional side view of an Under- 2: wood-Hanson combmed? typewriting and operator and some principal parts of the computing mechanism. 7

Fig.16'is a side view of a pin bar. Fig. 7 shows the connections of the subtraction setting key.

Fig. 8 is a plan view of the same. r

Fig. 9 shows a latch adapted to lock the subtractionkey in its effective position.

Fig. 10 is a section through the computing wheels and some adjacent parts.

Fig. 11 is a sectional side view of the computing wheels, the frame carrying them and the carry-over mechanism all in thelr normal positions.

Fig. 12 is a view similar to Fig. 11, showing the parts in adding position.

Fig. 13 shows the same parts set for tenscarrying.

Fig. 14: shows the same parts while subtracting.

Fig. 15 shows the same parts set for tensborrowing.

Figs. 16, 17, 18 and 19 are successlve sectional side views of the'power driven carry over shaft and parts it carries.

Fig. 20 is a perspective view of the parts seen. in Figs. 16 to 19 as assembled on said drive shaft. 7

Fig. 21 is a view similar to Fig 13, but showing the mechanism in the act of carrying-over while adding.

Fig. 21 1s a view slmilar to Fig. 21, but

showing the completion. of the operation of either carrying ten or borrowing ten; this view being partly intended to illustrate the method by which overthrow of the tenscarrying and borrowing device is prevented.

Fig. 22 is a plan view of some of the connections between the typewriter keys and the pin bars.

Fig. 23 is a plan view showing the pln bars with most of the parts above them removed.

Fig. 2a shows a pin bar in its normal idle position. I V

Fig. 25 is a sectional front view of the parts seen in Figs. 22 and 24, showing the pins on the pin bars.

Numeral keys 1 and alphabet keys 2 operate levers 3, 1, to vibrate type bars 5 upwardly, to strike against the front side of a platen 6 mounted on a carriage 7 which tra'velson a rail 8, and is controlled by a rack 9 meshing with a pinion 10 connected to an escapement wheel 11.

Each type bar has a heel 12 to engage a universal bar 13 mounted on a frame 1 1 which operates a rocker 15 having vibratory dogs 16, 17, to engage said escapement wheel and permit the carriage to feed step-by-step under the impulse of the usual spring barrel (not shown) The computing mechanism includes an index mechanism which is'operable by the numeral keys; each key having a pendent rod 18 to engage and depress the corresponding one of a seriesof rock arms 19 (Fig. 25),

which are arrayed across the machine, being mounted upon the forward ends of rearwardly extending horizontal rock shafts 20 (Figs. 22 and 25), forming parts of linkages -which depress the index pins.

Each rock shaft carries an upstanding.

key thus determines the value of the index pin which is depressed or selected, but the typewriter carriage 7 determines the denomination of the depressed pin; each link or de-' pressor bar 26 being capable of depressing one pin in each denomination.

The index pins are arranged in rows upon bars 28 extending forwardly and rearwardly beneath the links 26, and serving eventually to rotate the number wheels in a manner presently to be described.

Normally the index pins are out of the path of movement of the depressor bars 26' (see Fig. 24), but as the paper carriage 7 feeds step-by-step, the bars 28 are displaced forwardly one after another, to positions to bring their pins within range of the depressor bars 26 (see Fig.6), so that anybar 26 may depress the corresponding pin of the forwardly displaced pin bar. Any suitable driven endwise forwardly for turning the number wheels. They are driven by means of a universal driverin the form of a transverse horizontal bar 29 which forms part of a general operator which is operated once for every calculation. r

The general operator in the Underwood- Hanson combined adding and typewriting machine comprises side bars 30 (Fig. 5) which are slid in guides on the side walls of the framework and are, rigidly united to form a-slide or carriage; said cross bar 29 forming one of the devices for tying said bars 30 together. This carriage or general operator may be driven in any suitable way, as for instance by a crank 31 which is fixed upon a transverse horizontal rock shaft 32, journaled at its ends in the framework of the machine, and carrying (Fig. 3) at its ends segments33 which mesh with idle pinions 34, the latter meshing with racks 35 formed upon said general operator side bars 30.

A movement of the crank 31 forwardly from the Fig. 3 position causes the general operator to drive forwardly, and the bar 29 thereon engages any depressed index pins 27, and drives forward the bars 28 on which they are mounted.

At its forward end each of said index pin bars 28 carries an addition rack 36 normally out of mesh with a pinion 37, which is fixed to a number wheel 38 forming one of a gang, there being one pin bar 28 for each number wheel. These number wheels are arranged below a sight opening 39 in the casing of the machine.

The cross bar 29, which engages the depressed index pins, is placed some distance behind said pins, so as to permit considerable lost motion of the general operator before the first pin can be engaged by said cross bar, and during this lost motion, the racks 36 become meshed with the number wheel pinions 37. This result is effected in the following manner: Carried upon power shaft 32 and rotated thereby is a disk 40 (Figs. 3, 4, 5, 11 and 12), which, as soon as the crank 31 starts to turn, engages a rider or pawl 41 pivoted at 42 upon an arm 43 of a lever 45, which is fixed to and turns upon a transverse horizontal rock-shaft 44, and swings said lever from the normal position seen at Fig. 3 to the position seen at Fig. 12, so that a forwardly extending arm of said lever 45 may pull down, by means of a link 46, a framework which carries said number wheels on an arbor 49, thus bringing the pinions 37 into mesh with said adding racks 36. Hence as the general operator continues to drive forward under the impulse of the crank 31, the pinions are turned clockwise at Fig. 12, and the number wheels are turned in the same forward direction, thus performing addition; each number wheel being advanced to an extent dependent upon which of its index pins 27 was depressed After the crank 31 has been given a full forward stroke, it is swung backwardly to normal position to restore the general operator to its normal position. At the initial portion of the return stroke of the crank 31 and its shaft 32, the rider or pawl 41 turns counter-clockwise at Fig. 12 (the cam 40 now turning in the reverse direction from that indicated by the arrow at said figure), and by a very slight rotation of said pivot 42, said pawl is rendered no longer capable of supporting the arm 43. This permits springs 47 (Figs. 8, 10, and 11) to draw rearwardly \l-shaped or double cam levers or arms 47 a pivoted at 47", which engage the ends of said arbor 49 and thereby raise said wheels clear of the rack bars 36, so that the parts 43 and 45 are restored to their normal positions.

This movement, which withdraws the pin ions 37 from the addition racks 36, takes place before the racks themselves start upon their return or rearward movement to nor mal position; such return being preferably effected by the same cross bar 29 which previously carried the racks forward. The cross bar, for this purpose, engages lugs 48 pendent from the rack bars in the rear of the cross bar 29, but is arranged to have considerable idle rearward motion (enough to permit collapse of pawl 41) before engaging said lugs 48.

At this point it may be noted that the arbor 49 on which the number wheels 38 and their pinions 37 are mounted, forms a tierod connecting the two sides 50 and 51 of a swinging frame (Fig. 4), which has bearings or sockets at 52 to swing upon collars 53 carried by a transverse horizontal shaft 54; this shaft forming a convenient hinged support for said frame 50, 51, and keeping the computing wheels always in proper relationship to the shaft 54, which is connected to the general operator and carries certain prime moving tens-carrying devices, as will presently be explained.

The side members 50, 51 are also connected by a tie-rod 55. The arm 45 of the shifting lever may be duplicated at 56, and the link 46 may be duplicated at 57; the shaft 44 forming a rigid connection between 45 and 56, so that the links 46, 57 pull down both sides of the number wheel shifting frame 50, 51. The arms 45, 56 may be further rigidly connected by a rod 58 to the ends of which the links 46. 57 may be pivoted.

Upon each of said index pin bars 28 is carried not only an addition rack 36, but also a subtraction rack 59 which is idle, as at Fig. 12, during the addition operation. This rack is parallel with the addition rack 36, but above the pinion 37; and is connected by an arm 60 with the forward end of the bar 28.

To cause the machine to subtract at the driving strokes of the index bars 28, it is only necessary to move the computation pinions 37 into mesh with the subtraction racks 59, instead of the addition racks 36. so that the number wheels will be turned backwardly at the ensuing forward drive of the index bars 28.

hen the operator desires that the machine shall perform subtraction, he presses rearwardly a subtraction key 61 on the forward end of a rod or bar 62, which extends from front to rear of the machine. and slides on a rest 62. Between its ends, this rod carries a cam 63 (Figs. 4, 5, 7 and 23), which during the backward thrust of the rod, engages the end of a sleeve 63, and forces the same endwise along the shaft 32 together with. the cam disk40, which is fast to said sleeve 63 thus-displacing the latter and silencing the pawl 41. At the same time is broughtinto play'a second cam disk 64 also -fast to said sleeve,which is effective only. for

the purpose of subtraction, I

This disk 64 is arranged tocotiperate with afollower orpawl 65, which is out of line with the pawl 41, that is, it works in a different plane; the disk 64 being shifted into the same plane as its pawl 65 when the cam disk 40 is shifted out of engagement with the pawl 41.

During the ensuing forward stroke of the the remainder of the forward stroke of the general operator. On the'return stroke, the pawl '65 releases the arm 74, and then the cam arms 47 a draw the number wheels clear of the'racks 59. p

It will be seen that the pawls 41 and 65 are provided with. springs 66 which restore the pawls to normal positions either during the endwise shifting of the cams or disks through a hole in disk 40.

40, 64, or at the end'of the return stroke of the general operaton. Normally spring 47 and arm'47 Fig. 11, hold the lever in its midway'position, and the pawls 41 and stand ready for engagement with their respective cams 67 and 68, as at Fig. 3.

These cam disks 40, 64 are splined to the shaft 32 by means of a pin 69 carried on an arm 7 O fixed to said shaft, and passing The tens-carrying or carry-over devices comprise an idle pinion 71 meshing with a rack 72 on the general operator, to connect said operator with a pinion 73 on the horizontal transverse shaft 54 having a helical series of cams or tappets 75 forcarrying tens at the addition operation. This shaft 54 7 turns in only one direction, and is operated only during the return stroke of the general operator; being for this purpose connected by a ball clutch mechanism 76 to the pinion 73, as seen at Fig. 2. A spring 132 holds a detent 132 (see Fig. 5) to prevent backward rotation of the shaft 54.

Each number wheel (except that of lowest denomination) has an individual train of mechanism for connecting it to this powerdriven tens-carrying shaft 54, but the train is normally broken, and hence the tappets or cams 75 are all normally ineffective; Each number wheel 38 (except that of highest denomination) has astarting tooth 77, the

functionof which is to establish a. connection fromzthe number wheel of next higher denominationto the tens-carrying shaft 54. Each of the trams of connectmg devices includes (Flg. 1) a pawl 78 to mesh with a gear 79 fixed upon the number wheel; the

pawl preferably having multiple teeth 80, or

being in the form of a short rack, as shown.

Each pawl is normally out of mesh with its gear wheel 79, but the starting tooth 77 operates means for positioning the pawl so that the pawl will, at thev proper time, come up into mesh with its pinion, and at the same time provide for thesubsequent driving movement of the pawl. i

To this end, the pawl 78 has a pin-and-slot connection at 81 with a two-armed lover or tumbler which is in the nature of an interponent device between the power driven tens-carrying cams 75 and the number wheel rotating pawl 78; thislever being pivoted between its ends upon an arbor 82, and having a short arm 83 provided'withfa pin 84 in the path of said starting or setting tooth 77.

The number wheel .38 turns in the di-- rection of the arrow, or clockw1se,as at. Fig. 12, to perform addition. The setting tooth 77, at the completion of a full reVolu tion of said number wheel 38, engages and. depresses the pm 84 together with the arm 83, swinging said interponent lever orrocker to the position seen at F ig, 13. V

The lower arm 85 of said lever or rocker has a slot to engage with the pin 81 on the tens-carrying pawl 7 8, which by the movement of the rocker to the Fig; 13 position is drawn back from the normal position at i Fig. 12. Upon said arm 85 is a cam-like tooth 86, which at Fig. 13 is seen as having been swung into the path of the associated tappet 75 on the tens-carrying shaft 54, the function of the latter being to act upon said tooth 86, and thereby return the rocker forward to its normal position. During such return movement, the rocker arm 85 carries.

with it the pawl 7 8, which, however, has in the meantime been swung up into mesh with,

the gear 79 of the number wheel next higher than that which carries the setting tooth 77,

whose movement has just been mentioned.

The forward swing of the pawl 78 is efiie fected by the engagement of the tappet 75 with the rocker tooth 86; there being provided upon the tens-carrying, shaft 54 a cam 87 which depresses the rear end of the pawl 78, and lifts the forward end thereof into mesh with said gear 79 as at Fig. 21; the pawl being supported between its ends by a rod 88'wl1ich rigidly connects arms 89 pendent from the'side plates" 50, 51, thus forming part of said frame comprising the arbor 49' .and extending forwardly from the collars 53 on said shaft 54, to rock up and down for shifting the adding pinions into and out of mesh with the driving racks 36.

- By means of said pawl 78, the higher number wheel is advanced one point by the time the rocker reaches the Fig. 12 position. The cam 87 has a continuation or dwell por tion 90 which holds down the rear end of the pawl 7 8 during the wheel driving movement, and which thereupon releases said pawl and permits the forward end thereof to be snapped down by a spring 91 out of mesh with the gear 79; a spring detent 92 engaging the latter to hold the number wheel in position.

At the subtracting operation, which includes what maybe called tens-borrowing, the setting tooth 77 on the number wheel, which is travelingcounter-clockwise (Fig. 14), lifts the arm 83 and swings the rocker to the Fig. 15 position.

The upper arm 93 of the rocker has a tooth 9st which is swung into the path of a cam or tappet 95 on the power shaft 54; the tappets 95 being spirally arranged and being paired with the tappets 7 5. The tappets 95 are in different planes from the tappets 75, and the tooth 9% is correspondingly offset from the arm 93. The cam 87 depresses the rear arm 96 of the pawl 78 and elevates the front arm thereof into mesh with the gear 7 9, and then the tappet 95 camming or acting upon the tooth 91, swings the rocker 93, 85 to the normal midway position at Fig. 12; thus drawing backwardly the pawl 78. At the conclusion of the tensborrowing operation, the cam 87 releases the rear arm 96 of the pawl, and the forward arm of the latter is drawn down by the spring 91 as before.

Each cam 90, together with its associated tappet 7.5 and 95, forms a group, and said groups, seen at Fig. 20, are arranged spirally on the shaft 54, so that the computing wheels are successively operated by the carry-over devices from lower to higher denominations.

It will be seen that the rocker 85, 93 may be regarded as a tumbler or interponent, since it disposes the pawl 78 to be operated by the tappets 75, 95 on the power shaft 5 1; and that the operation of said rocker, as effected by the tappets, resembles the operation of a pallet in an escapcment mechanism. i

The rocker or tumbler 85, 9-3 is held in any of its three positions (Figs. 3, a, 11 to 15) by means of a detent arm 97 pivoted upon a rod 98. which rod connects the side arms 50, 51 just in front of the rod 55, and said detent arm is pressed downwardly by a spring 99 coiled around the rod 55;the de-' tent arm having three notches 100, 101 and 102 to engage a pin 103 on the tumbler to hold the same in any of the three positions seenat Figs. 12 to 15..

It will be seen that the sides of the notches 100 and 102 are extended to form hooks which positively stop the rocker 85 at each of its extreme positions; although, if desired, this rocker 85 may be positively arrested by the engagement of either 86 or 9a with the circular hub portions 103 of the disks on which the cams or tappets 75 and 95 are formed, Figs. 10 and 20.

It will be understood that, owing to the speed with which the power-driven tenscarrying shaft 5% revolves, the tappet 75 is apt to operate the tens-carrying lever 85, 93 at such speed, in swinging it to the normal position seen at Fig. 21, that the lever, with the pawl 28 and the number wheel, might overthrow; and to guard against this, there are provided on the shaft 5 1- stops 95 concentric with said shaft and merging into or being continuations of the tappets 95. These stops 95 are so placed that each occupies the path of the tooth 94 on the associated rocker 85, 93, when the latter is swung by the tappet 75' from the Fig. 21 position to the normal position at Fig. 1, 3, 11, 12 and 21 Of course the shaft 54: is revolving, and it is only for a brief period that the stop or dwell portion 95 remains in the path of the tooth, shoulder or projection 9st; but this is sufficient to prevent overthrow of the rocker 85, 93.

Overthrow is prevented at the operation of borrowing tens, in a similar manner. At Fig. 15 the member 85, 93 is shown as rocked over to begin a subtraction operation; and after the pawl 78 is elevated, the tappet 95 engages the tooth or shoulder 94: and swings it to the position at Fig. 21, at which time the shoulder or projection 86 will be arrested by stop 95" which is a continuation of the tappet 75. This positively prevents overthrow of the rocker 85, 93 at the subtraction 0r tens-borrowing operation, the stop or dwell 95 being sufficiently long for this purpose.

The number wheels have individual tenscarrying trains each comprising the tumbler, the detent arm, the pawl, and the gear 79. It will be understood that all of these tenscarrying trains are mounted upon the swing ing frame 50, 51, and, therefore, that the number wheels with their pinions, detents 92, gears, and tens-carrying trains swing up and down as a unit about said power shaft 54, which serves as a support for the rear end of said frame, as already explained. Owing to the fact that these members swing up and down as a unit, the setting tooth 77 isenabled, to perform its functions properly whether the wheels are in the addition position as at Fig. 13, or in the subtraction position as at Fig. 15. V

The reason for arranging the tappets 75 (and tappets 95) in spiral relation around the power shaft 54, is that this enables tens "to be carried upon the number wheels 7 seriatim, so that'the machine is capable of carrying '1 over from wheel to wheel throughout'the entire set at the tens-carrying operation; the operation ofone tenscarrying train being finished before the operation of the next higher train can begin.

- be confined between the racks 36 and the tumbler arms 85.

The subtraction key rod 62 is held back during the subtraction operation by means 7 of a latch 105 (Figs, 3, 4 and 7), which is pivoted at 106 upon the framework and is Q: held by a spring 107 in a notch 107 b in the .rod' or bar 62. This latch is automatically released at the conclusion of the return stroke of the general operator, after the op 7 mechanism has been completed. This latchwhich restores the index pins 27 to normal 7 releasing operation occurs simultaneouslywith. the raising of the universal plate 108,

positions. The plate 108 is operated in the 'usualmanner, and is pivoted as usual upon 7 bell cranks 109 connected by a link 110. 30

During the last part of the return stroke of the general operator, a pawl or abutment 111 on a side bar 30 usually engages an arm 112 connected to one of the bell cranks to cause the latter to swing, and the plate 108 V to rise, thereby lifting the index pins 27.

'Thereuponthe arm 112 trips off from the abutmentlll and the plate 108 drops.

During the rise of the plate 108, an arm latter forwardly to normal positlon, as seen at Fig. 3.

r This returns the sleeve 63 and'the cam 64. to" their normalpositions in whichthe ma-V chine adds.

It will be seen that the arm 113 is fixed upon a rock shaft 116 upon which one of I the bell cranks 109 is fixed. If it'be desired 7 V to retain the key 61 in its rearward posi 1 tion, a bolt 117 (Figs. 8 and 9) may he slid to the left by means ofa finger-piece 118 to engage'anotch 119 in the rod 62.; a spring r 120 holding the bolt in either posi-" i -T a 1 The index pin bars 28 may be guided at their forward ..ends ina'comb121 (Fig. 3),

detent and maybe confined between said comb and a rod '122 forming partbfthe fixed framework of tl1e, ,machine. At their rear. ends" th ebars may be guided in a fixed comb 123. j The means for setting said index pinjbars 28'1""orward1y', so as fto'liring thein'dex pins wheels to a predetermined struction, and for the sake of illustration there is shown a device for this purpose comprising vertical levers 124 pivoted between their ends at 125, the lower ends of these levers being adaptedto strike the rear ends of the index pin bars 28. At the1r upper ends, these levers are engageable by beveled dogs 126 pivoted upon lugs 127 on the'carriage 7; the levers being arranged at letter-space intervals, so that'at each letter 4). The dogs 126 are individually pivoted 1 eration'of the tens-borrowing or carry-over so as to permit them to ride idly over the fingers 129 are pressed by springs 130 against shoulders 131 on the index pin bars 27 into register with the pin-depressing 4 linkages 26, may be of any suitable con- 28, to return them one after another from r the positions to which they are displaced by the levers 124; said fingers 129 riding idly on the top edges of said index pin bars 28 during the wheeldriving movements of the latter. Other devices may be employed for connecting the index pin bars 28 to the carriage 7. I

Reference is made to United States Hanson Patent No. 905,421 of December 1, 1908 for further explanation of the operation of machines of this general class.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, 1 claim:

1. In a computing machine, the combina' jtionwith computing. wheels and numeral which said computing wheels are ournaled,

carryfover devices'for said wheels, a frame compnslng said arbor and'carrying said carry-over devices, and a power-driven shaft for operating said carry-:over devices, on which shaft said frame is pivoted.

2. Ina computing machine, the combina tion with computing wheels and rack bars each comprising an addition rack and a subtraction rack for turning said computing extent, of a gen eral operator for driving saidi'ack bars, a

[shaft driven fbysaid :general loperatcr, a

frame for saidcomputing wheels normally "holding them clear of said rack bars, a lever for moving said frame;v and' cams on said.

. said interponents.

shaft for selectively moving said e'omput ing wheels in said frame into and out of mesh with the racks on said rack bars.

3. In a computing machine, the combination with double racks for temporarily registering numbers, of computing wheels normally out of mesh with said racks into which the numbers so registered are carried ing said subtraction key when said numbers are so carried into saidwheels and the ca rry-over is completed.

4-. In a computing.machine, the combination with computing wheels, of carry-over devices for operating said wheels after said wheels have been all set, a power-driven shaft rotated in one direction only, and pavrls driven by said power shaft to cause said carry-over devices to be edect ve for adding or subtracting according to whether the computing wheels are adding or sul tracting.

5. In a computing machine, the combination with rack bars, of computing wheels, an arbor carrying said computing wheels, a rack on each'rack bar on each side of said con'iputing wheels, a shaft lying between said racks on which said arbor is pivotally supported, carry-over devices for said com puting wheels carried on said pivotal support, and a shaft forming part of said pivotal support for driving said carry-over devices to an extent determined by said computing wheels.

6. In a computing machine, the combination with rack bars each comprising two racks, of an arbor lying between said racks, computing wheels journaled on said arbor,

a frame of which said arbor forms a part for shiftin said com utin wheels carrv- O L b 7 u ever devices in said frame, interponents set by said computing wheels to operate said carry-over devices according to which rack the computing wheels engage, and pawls for turning said computing wheels in opposite directions as determined'by the Sd lililg of 7. In a computing machine, the combination with computing wheels and a carry-over tooth on each wheel, of an interpone nt for e'achcomputing wheel set by its carry-over tooth, afloatingpawl forthe'ad acent computing wheel set by its interponent to rotate said wheel in either direction, a power-driven shaft, means carried :by said power-driven shaft for 'IDQYlD 'SZUCl pawl into engagement with its wheel, and separate means on said shaft for then rotating it.

8. In a computing machine, the combination with computing wheels and a carry-over tooth on each of said wheels, of an interponcnt pivoted adjacent each wheel, an arm on said interponent arranged to be struck by said carry-over tooth, a pawl set by said interponcnt, a power-driven shaft comprising in ans for moving said pawl into mesh with its wheel, and separate means for then driving the pawl in a manner determined by said interponent.

9. In a computing machinc,the combination with computing wheels, of a carry-over tooth on each wheel, an interponent pivoted adjacent to each wheel, an extension on said interponent each side of said pivot, a pawl set by said interponent and moved thereby,'and a power-driven shaft arranged to drive said pawl by one of said extensions according to the manner said interponent has been set by its carry-over tooth.

10. In a computing machine, the combination with computing wheels, of a carry-over pawl for each wheel, means for moving said pawl in either directien, and means for moving said pawl into engagement with its computing whecl to actuate the same, and then actuating the computing i113 pawl to normal position.

11. In a computing machine, the combination with computing wheels, of a carry-over pawl for each wheel, a power-driven shaft normally ineffective with reference to said pawls, means on said power-driven shaft for successively raising each pawl into engagement with its computing Wheel, and means on said shaft for moving said pawls in either direction to rotate said wheels.

12. In a computing machine, the combination with computing wheels, of an interponent for each wheel, a carry-over tooth on each wheel for setting its interponent, a detent for holding the interponent in said position, a pawl positioned by said interponent, and a power-driven device for driving said interponents to turn said wheels and restore said interponents to normal position.

13. In a computing machine, the combina tion'with computing wheels, of a rack bar for rotating each wheel but normally ineffective with reference to said wheel, acarry-- tion with. computing wheels, of a power heel by returning.

p&'

driven shaft'rotating in one direction only, carry-over interponents set by sald comput ing wheels, means on said interponents for causing said power-driven shaft to move them in either direction, and a carry-over pawl for each interponent by which each 1nterponent drives ltSWhGel.

15. Ina computing machine, the 'combination with computing wheels, of an interponent pivoted ad acent each wheel, means on each wheel for rotating each interponent in either direction, a carry-over pawl moved by said interponent to advance the wheel,

and a power-driven device arranged torestore said interponents to normal p0S1t1 OI1, and 111 so doing to turn said computlng wheels by said pawls. V v a ,16. -Ina computing mach ne, the comb1na-- tion with computing wheels,of a carry-over interponent pivoted adjacent each comput ing wheel, means for setting each interponent in eitherone oftwo positions away fromnormah' apower-driven shaft, and.

means for returning the set interponents to normal ,to turn said computing wheels as determined by the set nterponents.

l 17. In a computing machine, the combination with computing wheels, of carry-over ypawls, a power-driven device,an interponent moving each of said carry-over pawls, and means on saidinterponent for causing said power-driven device to move it 1n either d1? rection to move its pawl.

'18. In a computing machine, the combinat1onw1th computing wheels, of a pivoted interponent'adgacent eachrwheel, a carry-over 7 pawl moved by said interponent, an exten- 'sion onsaid interponent upon each side ofits pivot, and a power-driven device to move said lnterponent by said extensions.

7 '19. In a computing machine, the combinationwith computing wheels and rack bars 1 for turning them, of a general operator for said rack'bars, means for moving said general operator, a frame 1n wh1ch said computing-wheels are carried, a connect-ion for mov-' ing said frame to cause said wheels to mesh wlth thelrrack bars by said moving means, carry-over pawls also carried in said frame,

and separate means for causing said carry-. a over pawls to engage with their computing wheels. 3 V

20. Ina computing machine, the combination withcomputing wheels and'separate rack bars for driving them in eitherdirec; tion, of cams revolving with the movement of said rack bars, a frame :in which" said wheels are carried, a'lever comprising tapj 1 pets a'r-ra'nged'to selectively cooperate with" said camsyto move'said frame tocause said wheels tolmesh with'their selected rack bars,

5 and means for shifting said cams to cause tion toso select the rack bars.

said frame to be moved in the desired'direo 2 1. In acomputing machine, the combination with computing wheels, of rack bars 7 each comprising two racks, a frame in which said wheels are carried, a lever for moving said frame to cause said wheels to mesh with,

either-rack, a general operator for driving setting said cams to cause them to selectively move said wheels into engagement with either rack. I T

23. In a computing machine, the combination with carry-over devices, of a powerdriven shaft, spirally-arranged cams on said power-drivenshaft to make said carry-over devices efi'ective, and SPll'EtllY-fllfillgfidtaP- carry-over membersj V 24. A tens-carrying mechanism comprising a rocker movable from nOrmalEposition' by the computing wheel, a shaft having a tappet to return said rocker, a pawl operated 1 by said rocker for advancing the next higher computingwheeh'and a stop on said shaft to prevent overthrow of said rocker upon reaching normal position.

25. A carry-over mechanism comprising -said rack bars, cams turning with the move ment of said general operator, anda key for pets on said shaft to. operate the effective .7

a rocker movable from normal position in either direction by the computing wheel,a'

shaft having tappets to drive said rocker from either of its abnormal positionsback to normal position, a pawl operatedfby said rocker for either advancing or retractingthe next higher computing wheel, and stops on saidshaft to prevent overthrow of said rocker in either direction upon returning to ,normal position. 7 a c ,7

26. A carry-over. mechamsm comprising a rocker movable from normal pos'ition'in :either direction by the computing wheel, a

shaft having tappets to drive said rocker from either of its abnormal positions back to normal position, a pawl operated by'said rocker for either advancing or retracting the next higher computing wheel, and stops on said shaft to prevent overthrowflof ,said

rocker in either direction upon returning to normal position; said rocker having two projections or shoulders, one for addition and one for subtraction, to be'engaged by: said tappets and stops, and theaddition'tappet being continued to formthe subtraction stop, and the subtraction tappet being con' tinued toform the addition stop.

27,1 1 a combined typewriting'ian'd am;

pnting machine, the combination with computing wheels adapted to add or subtract, of carry-over devices for moving said wheels in opposite directions, and a shaft independent of said wheels and always turning in the same direction, having spirally arranged members adapted to drive said carry-over devices in either direction.

28. In a combined typewrit-ing and computing machine, the combination with computing wheels and a. carry-over shaft, of a frame. carrying said wheels mounted on said shaft, and carry-over devices driven, by said shaft adapted to carry or borrow on said wheels.

In a computing machine, the combination with: computing wheels, of a carryover tooth on each. wheel, an interponent set by said carry-over tooth, and a toothed member engaging the adjacent computing wheel to positively rotate it one unit space in either direction as determined by said interponent, and to positively arrest it when so turned.

30. In a computing machine, tlrecombina tion with computing wheels, of a carry-over tooth on each wheel, an liltBFPODt-llt set by said carry-rover tooth, a toothed member en,- gaging the adjacent computing wheel to, rotate it in either direction one unit space as determined by said interponent, and to positively arrest it, and a power driven shaft for so driving said toothed member.

31. In a computing machine, the combination with computing wheels and a carryover tooth on each of said wheels, of an in terponent pivoted adjacent each wheel, a bar on said interponent arranged to be struck by said carry-over tooth, a toothed member set by said interponent, and a power driven shaft for moving said toothed member into mesh with its wheel, and then turning it in a manner determined by' said interponent, and then positively arresting it.

32. In a computing machine, the combination with computing wheels, of a carry-over tooth on each wheel, an interponent pivoted adjacent each Wheel, an extension of said interponent on each side of its pivot, a toothed member set by said interponent and moved thereby, and a power driven shaft arranged to drive said toothed member by one of said extensions according to the manner said interpouent has been set by its carry-over tooth, and to positively arrest the computing wheel by the other extension.

33. In a computing machine, the combination with computing wheels and a carryover tooth for each wheel, of a toothed memher for each wheel, means for setting said toothed member to turn said wheel in either direction, a power driven member arranged to successively operate all said toothedmembers, and means connected to said power driven member for positively arresting each wheel, when so turned.

3% In omp ing ma ne, the c m ation with computing wheels and a, carry over rack-banter each wheel, of means, for moving said rack bar in either direction, a carry-over tooth for said rack-bar, a power driven shaft for successively operating all said rackbars, and means for arresting said rack-bars by said power driven member to positively hold the'computing wheels against over-throw,

In a computing machine, the combination with computing wheels, of a carry-over rack-bar for each, wheel, means. for moving said racksbar in either direction, means for moving said rack-bar into engagement with itscomputing. wheel; to, actuate the. same by returning the rack-bar to its nOrmal posit on, and means for positively preventing over-throw of the carry-over wheel by its rack-bar. I

36. In a computing machine, the combina tion with computing wheels, of a carry oiver rack-bar for each wheel, a power driven shaft normally inefiective with reference to said raclebars, means on said shaft for successively raising each rack-bar into. engagement with its computing wheel, and means on said shaft for moving said members in either direction to rotate said wheels, and then to positively arrest them.

37. In a computing machine, the combinaier-1 w h ompeti g W eel o an interponen for each wheel, a carry-over tooth on each wheel for setting its interponent, a detent for holding the interponent in said position, a rack-bar positioned by said interponent, a power driven device for driving said interponents to turn said wheels and return said interponents to normal position, and means for positively preventing overthrow of said computing wheels by said interponen ts.

38. In a computing machine, the combination with computing wheels, of a power driven shaft rotating in one direction only, carry-over interponents set by said computing Wheels, means on said interponents for causing said power driven shaft to move them in either direction, a carry-over rack for each interponent, and means effective on its interponent for positively preventing overthrow of any computing wheel.

39. In a computing machine, the combination with computing wheels, of a carry-over interponent pivoted adjacent each computing Wheel, means for detaining each interponent in any one of three positions, a power driven shaft, means for turning said computing wheels as determined by the detained interponents, and means for positively preventing over-throw of the computing wheels by their interponents.

40. In a computing machine, the combination with carry-over devices, of a power driven shaft, spirally arranged cams on said shaft to make said devices efi'ective, spirally arranged tappets on said shaft to operate the effective carry-over devices, and spirally arranged members on said shaft to positively prevent over-throw by said carry-over devices.

41. In a decimal computing machine, the combination with a series of decimal dial wheels, of a series of racks arranged to drive said dial wheels in opposite directions, a series of carry-over racks normally occupying an intermediate position, means for giving said carry-over racks a predetermined offset at the passing of the associated dial wheels to Zero when completing a revolution, the offset being in one direction or the other according to whether addition or subtraction is being carried on, and means for enabling said carry-over racks to transmit the offset to the next higher dial Wheels to effect carryovers, by returning the associated carry-over racks to their intermediate position.

42. The combination with a series of computing Wheels, of a series of rack bars for driving said computing wheels, and normally disengaged therefrom, means for effecting a relative shifting movement between said rack bars and said computing wheels to eflect a driving engagement before a driving movement of said rack bars, a traveling carriage, a tappet carried by said carriage, and a series of l vers directly engaged by said tappet, and directly engaging said rack bars to advancethem slightly in the direction of their 7 driving movement While disengaged from said computing Wheels to efiect denominational selections.

43. The combination with a series of (30111 puting wheels, of a gear on eachof said computing wheels, rack bars normally disengaged' from said gears, an indexing mechanism for determining the extent of movements of said rack bars, spring means for maintaining said rack bars normally in such a position that said indexing mechanism ill be ineflective, a traveling carriage, and a series of levers operated directly from said carriage, and directly engaging said rack bars to render effective said indexing mechanism sem'atim for each of said rack bars when said rack bars are disengaged from said gears by advancing said rack bars slightly in the direction of drive against the tension of said spring means.

L4. The combination with a series of dial wheels, of a series of rack bars for driving said dial wheels, a traveling carriage, a tappet carried by said carriage, and a series of levers mounted on a fixed pivot arranged to be cammed rearwardly by said tappet, to force forwardly by direct engagement said rack bars to effect denominational selections.

HANS HANSON.

Witnesses EDWARD P. STORY, GEORGE H. VARNEY.

Gopiel of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

